// Module systems magic dance
(function (definition) {
  // RequireJS
  if (typeof define == "function") {
    define(definition);
    // YUI3
  } else if (typeof YUI == "function") {
    YUI.add("es5", definition);
    // CommonJS and <script>
  } else {
    definition();
  }
})(function () {

  /**
   * Brings an environment as close to ECMAScript 5 compliance
   * as is possible with the facilities of erstwhile engines.
   *
   * Annotated ES5: http://es5.github.com/ (specific links below)
   * ES5 Spec: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf
   * Required reading: http://javascriptweblog.wordpress.com/2011/12/05/extending-javascript-natives/
   */

//
// Function
// ========
//

// ES-5 15.3.4.5
// http://es5.github.com/#x15.3.4.5

  function Empty() {
  }

  if (!Function.prototype.bind) {
    Function.prototype.bind = function bind(that) { // .length is 1
      // 1. Let Target be the this value.
      var target = this;
      // 2. If IsCallable(Target) is false, throw a TypeError exception.
      if (typeof target != "function") {
        throw new TypeError("Function.prototype.bind called on incompatible " + target);
      }
      // 3. Let A be a new (possibly empty) internal list of all of the
      //   argument values provided after thisArg (arg1, arg2 etc), in order.
      // XXX slicedArgs will stand in for "A" if used
      var args = _Array_slice_.call(arguments, 1); // for normal call
      // 4. Let F be a new native ECMAScript object.
      // 11. Set the [[Prototype]] internal property of F to the standard
      //   built-in Function prototype object as specified in 15.3.3.1.
      // 12. Set the [[Call]] internal property of F as described in
      //   15.3.4.5.1.
      // 13. Set the [[Construct]] internal property of F as described in
      //   15.3.4.5.2.
      // 14. Set the [[HasInstance]] internal property of F as described in
      //   15.3.4.5.3.
      var bound = function () {

        if (this instanceof bound) {
          // 15.3.4.5.2 [[Construct]]
          // When the [[Construct]] internal method of a function object,
          // F that was created using the bind function is called with a
          // list of arguments ExtraArgs, the following steps are taken:
          // 1. Let target be the value of F's [[TargetFunction]]
          //   internal property.
          // 2. If target has no [[Construct]] internal method, a
          //   TypeError exception is thrown.
          // 3. Let boundArgs be the value of F's [[BoundArgs]] internal
          //   property.
          // 4. Let args be a new list containing the same values as the
          //   list boundArgs in the same order followed by the same
          //   values as the list ExtraArgs in the same order.
          // 5. Return the result of calling the [[Construct]] internal
          //   method of target providing args as the arguments.

          var result = target.apply(
            this,
            args.concat(_Array_slice_.call(arguments))
          );
          if (Object(result) === result) {
            return result;
          }
          return this;

        } else {
          // 15.3.4.5.1 [[Call]]
          // When the [[Call]] internal method of a function object, F,
          // which was created using the bind function is called with a
          // this value and a list of arguments ExtraArgs, the following
          // steps are taken:
          // 1. Let boundArgs be the value of F's [[BoundArgs]] internal
          //   property.
          // 2. Let boundThis be the value of F's [[BoundThis]] internal
          //   property.
          // 3. Let target be the value of F's [[TargetFunction]] internal
          //   property.
          // 4. Let args be a new list containing the same values as the
          //   list boundArgs in the same order followed by the same
          //   values as the list ExtraArgs in the same order.
          // 5. Return the result of calling the [[Call]] internal method
          //   of target providing boundThis as the this value and
          //   providing args as the arguments.

          // equiv: target.call(this, ...boundArgs, ...args)
          return target.apply(
            that,
            args.concat(_Array_slice_.call(arguments))
          );

        }

      };
      if (target.prototype) {
        Empty.prototype = target.prototype;
        bound.prototype = new Empty();
        // Clean up dangling references.
        Empty.prototype = null;
      }
      // XXX bound.length is never writable, so don't even try
      //
      // 15. If the [[Class]] internal property of Target is "Function", then
      //     a. Let L be the length property of Target minus the length of A.
      //     b. Set the length own property of F to either 0 or L, whichever is
      //       larger.
      // 16. Else set the length own property of F to 0.
      // 17. Set the attributes of the length own property of F to the values
      //   specified in 15.3.5.1.

      // TODO
      // 18. Set the [[Extensible]] internal property of F to true.

      // TODO
      // 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).
      // 20. Call the [[DefineOwnProperty]] internal method of F with
      //   arguments "caller", PropertyDescriptor {[[Get]]: thrower, [[Set]]:
      //   thrower, [[Enumerable]]: false, [[Configurable]]: false}, and
      //   false.
      // 21. Call the [[DefineOwnProperty]] internal method of F with
      //   arguments "arguments", PropertyDescriptor {[[Get]]: thrower,
      //   [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},
      //   and false.

      // TODO
      // NOTE Function objects created using Function.prototype.bind do not
      // have a prototype property or the [[Code]], [[FormalParameters]], and
      // [[Scope]] internal properties.
      // XXX can't delete prototype in pure-js.

      // 22. Return F.
      return bound;
    };
  }

// Shortcut to an often accessed properties, in order to avoid multiple
// dereference that costs universally.
// _Please note: Shortcuts are defined after `Function.prototype.bind` as we
// us it in defining shortcuts.
  var call = Function.prototype.call;
  var prototypeOfArray = Array.prototype;
  var prototypeOfObject = Object.prototype;
  var _Array_slice_ = prototypeOfArray.slice;
// Having a toString local variable name breaks in Opera so use _toString.
  var _toString = call.bind(prototypeOfObject.toString);
  var owns = call.bind(prototypeOfObject.hasOwnProperty);

// If JS engine supports accessors creating shortcuts.
  var defineGetter;
  var defineSetter;
  var lookupGetter;
  var lookupSetter;
  var supportsAccessors;
  if ((supportsAccessors = owns(prototypeOfObject, "__defineGetter__"))) {
    defineGetter = call.bind(prototypeOfObject.__defineGetter__);
    defineSetter = call.bind(prototypeOfObject.__defineSetter__);
    lookupGetter = call.bind(prototypeOfObject.__lookupGetter__);
    lookupSetter = call.bind(prototypeOfObject.__lookupSetter__);
  }

//
// Array
// =====
//

// ES5 15.4.4.12
// http://es5.github.com/#x15.4.4.12
// Default value for second param
// [bugfix, ielt9, old browsers]
// IE < 9 bug: [1,2].splice(0).join("") == "" but should be "12"
  if ([1, 2].splice(0).length != 2) {
    var array_splice = Array.prototype.splice;

    if (function () { // test IE < 9 to splice bug - see issue #138
      function makeArray(l) {
        var a = [];
        while (l--) {
          a.unshift(l)
        }
        return a
      }

      var array = []
        , lengthBefore
      ;

      array.splice.bind(array, 0, 0).apply(null, makeArray(20));
      array.splice.bind(array, 0, 0).apply(null, makeArray(26));

      lengthBefore = array.length; //20
      array.splice(5, 0, "XXX"); // add one element

      if (lengthBefore + 1 == array.length) {
        return true;// has right splice implementation without bugs
      }
      // else {
      //    IE8 bug
      // }
    }()) {//IE 6/7
      Array.prototype.splice = function (start, deleteCount) {
        if (!arguments.length) {
          return [];
        } else {
          return array_splice.apply(this, [
            start === void 0 ? 0 : start,
            deleteCount === void 0 ? (this.length - start) : deleteCount
          ].concat(_Array_slice_.call(arguments, 2)))
        }
      };
    } else {//IE8
      Array.prototype.splice = function (start, deleteCount) {
        var result
          , args = _Array_slice_.call(arguments, 2)
          , addElementsCount = args.length
        ;

        if (!arguments.length) {
          return [];
        }

        if (start === void 0) { // default
          start = 0;
        }
        if (deleteCount === void 0) { // default
          deleteCount = this.length - start;
        }

        if (addElementsCount > 0) {
          if (deleteCount <= 0) {
            if (start == this.length) { // tiny optimisation #1
              this.push.apply(this, args);
              return [];
            }

            if (start == 0) { // tiny optimisation #2
              this.unshift.apply(this, args);
              return [];
            }
          }

          // Array.prototype.splice implementation
          result = _Array_slice_.call(this, start, start + deleteCount);// delete part
          args.push.apply(args, _Array_slice_.call(this, start + deleteCount, this.length));// right part
          args.unshift.apply(args, _Array_slice_.call(this, 0, start));// left part

          // delete all items from this array and replace it to 'left part' + _Array_slice_.call(arguments, 2) + 'right part'
          args.unshift(0, this.length);

          array_splice.apply(this, args);

          return result;
        }

        return array_splice.call(this, start, deleteCount);
      }

    }
  }

// ES5 15.4.4.12
// http://es5.github.com/#x15.4.4.13
// Return len+argCount.
// [bugfix, ielt8]
// IE < 8 bug: [].unshift(0) == undefined but should be "1"
  if ([].unshift(0) != 1) {
    var array_unshift = Array.prototype.unshift;
    Array.prototype.unshift = function () {
      array_unshift.apply(this, arguments);
      return this.length;
    };
  }

// ES5 15.4.3.2
// http://es5.github.com/#x15.4.3.2
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
  if (!Array.isArray) {
    Array.isArray = function isArray(obj) {
      return _toString(obj) == "[object Array]";
    };
  }

// The IsCallable() check in the Array functions
// has been replaced with a strict check on the
// internal class of the object to trap cases where
// the provided function was actually a regular
// expression literal, which in V8 and
// JavaScriptCore is a typeof "function".  Only in
// V8 are regular expression literals permitted as
// reduce parameters, so it is desirable in the
// general case for the shim to match the more
// strict and common behavior of rejecting regular
// expressions.

// ES5 15.4.4.18
// http://es5.github.com/#x15.4.4.18
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/array/forEach

// Check failure of by-index access of string characters (IE < 9)
// and failure of `0 in boxedString` (Rhino)
  var boxedString = Object("a"),
    splitString = boxedString[0] != "a" || !(0 in boxedString);

  if (!Array.prototype.forEach) {
    Array.prototype.forEach = function forEach(fun /*, thisp*/) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        thisp = arguments[1],
        i = -1,
        length = self.length >>> 0;

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(); // TODO message
      }

      while (++i < length) {
        if (i in self) {
          // Invoke the callback function with call, passing arguments:
          // context, property value, property key, thisArg object
          // context
          fun.call(thisp, self[i], i, object);
        }
      }
    };
  }

// ES5 15.4.4.19
// http://es5.github.com/#x15.4.4.19
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
  if (!Array.prototype.map) {
    Array.prototype.map = function map(fun /*, thisp*/) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        length = self.length >>> 0,
        result = Array(length),
        thisp = arguments[1];

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(fun + " is not a function");
      }

      for (var i = 0; i < length; i++) {
        if (i in self)
          result[i] = fun.call(thisp, self[i], i, object);
      }
      return result;
    };
  }

// ES5 15.4.4.20
// http://es5.github.com/#x15.4.4.20
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
  if (!Array.prototype.filter) {
    Array.prototype.filter = function filter(fun /*, thisp */) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        length = self.length >>> 0,
        result = [],
        value,
        thisp = arguments[1];

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(fun + " is not a function");
      }

      for (var i = 0; i < length; i++) {
        if (i in self) {
          value = self[i];
          if (fun.call(thisp, value, i, object)) {
            result.push(value);
          }
        }
      }
      return result;
    };
  }

// ES5 15.4.4.16
// http://es5.github.com/#x15.4.4.16
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/every
  if (!Array.prototype.every) {
    Array.prototype.every = function every(fun /*, thisp */) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        length = self.length >>> 0,
        thisp = arguments[1];

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(fun + " is not a function");
      }

      for (var i = 0; i < length; i++) {
        if (i in self && !fun.call(thisp, self[i], i, object)) {
          return false;
        }
      }
      return true;
    };
  }

// ES5 15.4.4.17
// http://es5.github.com/#x15.4.4.17
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
  if (!Array.prototype.some) {
    Array.prototype.some = function some(fun /*, thisp */) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        length = self.length >>> 0,
        thisp = arguments[1];

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(fun + " is not a function");
      }

      for (var i = 0; i < length; i++) {
        if (i in self && fun.call(thisp, self[i], i, object)) {
          return true;
        }
      }
      return false;
    };
  }

// ES5 15.4.4.21
// http://es5.github.com/#x15.4.4.21
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduce
  if (!Array.prototype.reduce) {
    Array.prototype.reduce = function reduce(fun /*, initial*/) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        length = self.length >>> 0;

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(fun + " is not a function");
      }

      // no value to return if no initial value and an empty array
      if (!length && arguments.length == 1) {
        throw new TypeError("reduce of empty array with no initial value");
      }

      var i = 0;
      var result;
      if (arguments.length >= 2) {
        result = arguments[1];
      } else {
        do {
          if (i in self) {
            result = self[i++];
            break;
          }

          // if array contains no values, no initial value to return
          if (++i >= length) {
            throw new TypeError("reduce of empty array with no initial value");
          }
        } while (true);
      }

      for (; i < length; i++) {
        if (i in self) {
          result = fun.call(void 0, result, self[i], i, object);
        }
      }

      return result;
    };
  }

// ES5 15.4.4.22
// http://es5.github.com/#x15.4.4.22
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduceRight
  if (!Array.prototype.reduceRight) {
    Array.prototype.reduceRight = function reduceRight(fun /*, initial*/) {
      var object = toObject(this),
        self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          object,
        length = self.length >>> 0;

      // If no callback function or if callback is not a callable function
      if (_toString(fun) != "[object Function]") {
        throw new TypeError(fun + " is not a function");
      }

      // no value to return if no initial value, empty array
      if (!length && arguments.length == 1) {
        throw new TypeError("reduceRight of empty array with no initial value");
      }

      var result, i = length - 1;
      if (arguments.length >= 2) {
        result = arguments[1];
      } else {
        do {
          if (i in self) {
            result = self[i--];
            break;
          }

          // if array contains no values, no initial value to return
          if (--i < 0) {
            throw new TypeError("reduceRight of empty array with no initial value");
          }
        } while (true);
      }

      if (i < 0) {
        return result;
      }

      do {
        if (i in this) {
          result = fun.call(void 0, result, self[i], i, object);
        }
      } while (i--);

      return result;
    };
  }

// ES5 15.4.4.14
// http://es5.github.com/#x15.4.4.14
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
  if (!Array.prototype.indexOf || ([0, 1].indexOf(1, 2) != -1)) {
    Array.prototype.indexOf = function indexOf(sought /*, fromIndex */) {
      var self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          toObject(this),
        length = self.length >>> 0;

      if (!length) {
        return -1;
      }

      var i = 0;
      if (arguments.length > 1) {
        i = toInteger(arguments[1]);
      }

      // handle negative indices
      i = i >= 0 ? i : Math.max(0, length + i);
      for (; i < length; i++) {
        if (i in self && self[i] === sought) {
          return i;
        }
      }
      return -1;
    };
  }

// ES5 15.4.4.15
// http://es5.github.com/#x15.4.4.15
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
  if (!Array.prototype.lastIndexOf || ([0, 1].lastIndexOf(0, -3) != -1)) {
    Array.prototype.lastIndexOf = function lastIndexOf(sought /*, fromIndex */) {
      var self = splitString && _toString(this) == "[object String]" ?
          this.split("") :
          toObject(this),
        length = self.length >>> 0;

      if (!length) {
        return -1;
      }
      var i = length - 1;
      if (arguments.length > 1) {
        i = Math.min(i, toInteger(arguments[1]));
      }
      // handle negative indices
      i = i >= 0 ? i : length - Math.abs(i);
      for (; i >= 0; i--) {
        if (i in self && sought === self[i]) {
          return i;
        }
      }
      return -1;
    };
  }

//
// Object
// ======
//

// ES5 15.2.3.14
// http://es5.github.com/#x15.2.3.14
  if (!Object.keys) {
    // http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
    var hasDontEnumBug = true,
      dontEnums = [
        "toString",
        "toLocaleString",
        "valueOf",
        "hasOwnProperty",
        "isPrototypeOf",
        "propertyIsEnumerable",
        "constructor"
      ],
      dontEnumsLength = dontEnums.length;

    for (var key in {"toString": null}) {
      hasDontEnumBug = false;
    }

    Object.keys = function keys(object) {

      if (
        (typeof object != "object" && typeof object != "function") ||
        object === null
      ) {
        throw new TypeError("Object.keys called on a non-object");
      }

      var keys = [];
      for (var name in object) {
        if (owns(object, name)) {
          keys.push(name);
        }
      }

      if (hasDontEnumBug) {
        for (var i = 0, ii = dontEnumsLength; i < ii; i++) {
          var dontEnum = dontEnums[i];
          if (owns(object, dontEnum)) {
            keys.push(dontEnum);
          }
        }
      }
      return keys;
    };

  }

//
// Date
// ====
//

// ES5 15.9.5.43
// http://es5.github.com/#x15.9.5.43
// This function returns a String value represent the instance in time
// represented by this Date object. The format of the String is the Date Time
// string format defined in 15.9.1.15. All fields are present in the String.
// The time zone is always UTC, denoted by the suffix Z. If the time value of
// this object is not a finite Number a RangeError exception is thrown.
  var negativeDate = -62198755200000,
    negativeYearString = "-000001";
  if (
    !Date.prototype.toISOString ||
    (new Date(negativeDate).toISOString().indexOf(negativeYearString) === -1)
  ) {
    Date.prototype.toISOString = function toISOString() {
      var result, length, value, year, month;
      if (!isFinite(this)) {
        throw new RangeError("Date.prototype.toISOString called on non-finite value.");
      }

      year = this.getUTCFullYear();

      month = this.getUTCMonth();
      // see https://github.com/kriskowal/es5-shim/issues/111
      year += Math.floor(month / 12);
      month = (month % 12 + 12) % 12;

      // the date time string format is specified in 15.9.1.15.
      result = [month + 1, this.getUTCDate(),
        this.getUTCHours(), this.getUTCMinutes(), this.getUTCSeconds()];
      year = (
        (year < 0 ? "-" : (year > 9999 ? "+" : "")) +
        ("00000" + Math.abs(year))
          .slice(0 <= year && year <= 9999 ? -4 : -6)
      );

      length = result.length;
      while (length--) {
        value = result[length];
        // pad months, days, hours, minutes, and seconds to have two
        // digits.
        if (value < 10) {
          result[length] = "0" + value;
        }
      }
      // pad milliseconds to have three digits.
      return (
        year + "-" + result.slice(0, 2).join("-") +
        "T" + result.slice(2).join(":") + "." +
        ("000" + this.getUTCMilliseconds()).slice(-3) + "Z"
      );
    };
  }


// ES5 15.9.5.44
// http://es5.github.com/#x15.9.5.44
// This function provides a String representation of a Date object for use by
// JSON.stringify (15.12.3).
  var dateToJSONIsSupported = false;
  try {
    dateToJSONIsSupported = (
      Date.prototype.toJSON &&
      new Date(NaN).toJSON() === null &&
      new Date(negativeDate).toJSON().indexOf(negativeYearString) !== -1 &&
      Date.prototype.toJSON.call({ // generic
        toISOString: function () {
          return true;
        }
      })
    );
  } catch (e) {
  }
  if (!dateToJSONIsSupported) {
    Date.prototype.toJSON = function toJSON(key) {
      // When the toJSON method is called with argument key, the following
      // steps are taken:

      // 1.  Let O be the result of calling ToObject, giving it the this
      // value as its argument.
      // 2. Let tv be toPrimitive(O, hint Number).
      var o = Object(this),
        tv = toPrimitive(o),
        toISO;
      // 3. If tv is a Number and is not finite, return null.
      if (typeof tv === "number" && !isFinite(tv)) {
        return null;
      }
      // 4. Let toISO be the result of calling the [[Get]] internal method of
      // O with argument "toISOString".
      toISO = o.toISOString;
      // 5. If IsCallable(toISO) is false, throw a TypeError exception.
      if (typeof toISO != "function") {
        throw new TypeError("toISOString property is not callable");
      }
      // 6. Return the result of calling the [[Call]] internal method of
      //  toISO with O as the this value and an empty argument list.
      return toISO.call(o);

      // NOTE 1 The argument is ignored.

      // NOTE 2 The toJSON function is intentionally generic; it does not
      // require that its this value be a Date object. Therefore, it can be
      // transferred to other kinds of objects for use as a method. However,
      // it does require that any such object have a toISOString method. An
      // object is free to use the argument key to filter its
      // stringification.
    };
  }

// ES5 15.9.4.2
// http://es5.github.com/#x15.9.4.2
// based on work shared by Daniel Friesen (dantman)
// http://gist.github.com/303249
  if (!Date.parse || "Date.parse is buggy") {
    // XXX global assignment won't work in embeddings that use
    // an alternate object for the context.
    Date = (function (NativeDate) {

      // Date.length === 7
      function Date(Y, M, D, h, m, s, ms) {
        var length = arguments.length;
        if (this instanceof NativeDate) {
          var date = length == 1 && String(Y) === Y ? // isString(Y)
            // We explicitly pass it through parse:
            new NativeDate(Date.parse(Y)) :
            // We have to manually make calls depending on argument
            // length here
            length >= 7 ? new NativeDate(Y, M, D, h, m, s, ms) :
              length >= 6 ? new NativeDate(Y, M, D, h, m, s) :
                length >= 5 ? new NativeDate(Y, M, D, h, m) :
                  length >= 4 ? new NativeDate(Y, M, D, h) :
                    length >= 3 ? new NativeDate(Y, M, D) :
                      length >= 2 ? new NativeDate(Y, M) :
                        length >= 1 ? new NativeDate(Y) :
                          new NativeDate();
          // Prevent mixups with unfixed Date object
          date.constructor = Date;
          return date;
        }
        return NativeDate.apply(this, arguments);
      };

      // 15.9.1.15 Date Time String Format.
      var isoDateExpression = new RegExp("^" +
        "(\\d{4}|[\+\-]\\d{6})" + // four-digit year capture or sign +
        // 6-digit extended year
        "(?:-(\\d{2})" + // optional month capture
        "(?:-(\\d{2})" + // optional day capture
        "(?:" + // capture hours:minutes:seconds.milliseconds
        "T(\\d{2})" + // hours capture
        ":(\\d{2})" + // minutes capture
        "(?:" + // optional :seconds.milliseconds
        ":(\\d{2})" + // seconds capture
        "(?:(\\.\\d{1,}))?" + // milliseconds capture
        ")?" +
        "(" + // capture UTC offset component
        "Z|" + // UTC capture
        "(?:" + // offset specifier +/-hours:minutes
        "([-+])" + // sign capture
        "(\\d{2})" + // hours offset capture
        ":(\\d{2})" + // minutes offset capture
        ")" +
        ")?)?)?)?" +
        "$");

      var months = [
        0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
      ];

      function dayFromMonth(year, month) {
        var t = month > 1 ? 1 : 0;
        return (
          months[month] +
          Math.floor((year - 1969 + t) / 4) -
          Math.floor((year - 1901 + t) / 100) +
          Math.floor((year - 1601 + t) / 400) +
          365 * (year - 1970)
        );
      }

      // Copy any custom methods a 3rd party library may have added
      for (var key in NativeDate) {
        Date[key] = NativeDate[key];
      }

      // Copy "native" methods explicitly; they may be non-enumerable
      Date.now = NativeDate.now;
      Date.UTC = NativeDate.UTC;
      Date.prototype = NativeDate.prototype;
      Date.prototype.constructor = Date;

      // Upgrade Date.parse to handle simplified ISO 8601 strings
      Date.parse = function parse(string) {
        var match = isoDateExpression.exec(string);
        if (match) {
          // parse months, days, hours, minutes, seconds, and milliseconds
          // provide default values if necessary
          // parse the UTC offset component
          var year = Number(match[1]),
            month = Number(match[2] || 1) - 1,
            day = Number(match[3] || 1) - 1,
            hour = Number(match[4] || 0),
            minute = Number(match[5] || 0),
            second = Number(match[6] || 0),
            millisecond = Math.floor(Number(match[7] || 0) * 1000),
            // When time zone is missed, local offset should be used
            // (ES 5.1 bug)
            // see https://bugs.ecmascript.org/show_bug.cgi?id=112
            offset = !match[4] || match[8] ?
              0 : Number(new NativeDate(1970, 0)),
            signOffset = match[9] === "-" ? 1 : -1,
            hourOffset = Number(match[10] || 0),
            minuteOffset = Number(match[11] || 0),
            result;
          if (
            hour < (
              minute > 0 || second > 0 || millisecond > 0 ?
                24 : 25
            ) &&
            minute < 60 && second < 60 && millisecond < 1000 &&
            month > -1 && month < 12 && hourOffset < 24 &&
            minuteOffset < 60 && // detect invalid offsets
            day > -1 &&
            day < (
              dayFromMonth(year, month + 1) -
              dayFromMonth(year, month)
            )
          ) {
            result = (
              (dayFromMonth(year, month) + day) * 24 +
              hour +
              hourOffset * signOffset
            ) * 60;
            result = (
              (result + minute + minuteOffset * signOffset) * 60 +
              second
            ) * 1000 + millisecond + offset;
            if (-8.64e15 <= result && result <= 8.64e15) {
              return result;
            }
          }
          return NaN;
        }
        return NativeDate.parse.apply(this, arguments);
      };

      return Date;
    })(Date);
  }

// ES5 15.9.4.4
// http://es5.github.com/#x15.9.4.4
  if (!Date.now) {
    Date.now = function now() {
      return new Date().getTime();
    };
  }


//
// Number
// ======
//

// ES5.1 15.7.4.5
// http://es5.github.com/#x15.7.4.5
  if (!Number.prototype.toFixed || (0.00008).toFixed(3) !== '0.000' || (0.9).toFixed(0) === '0' || (1.255).toFixed(2) !== '1.25' || (1000000000000000128).toFixed(0) !== "1000000000000000128") {
    // Hide these variables and functions
    (function () {
      var base, size, data, i;

      base = 1e7;
      size = 6;
      data = [0, 0, 0, 0, 0, 0];

      function multiply(n, c) {
        var i = -1;
        while (++i < size) {
          c += n * data[i];
          data[i] = c % base;
          c = Math.floor(c / base);
        }
      }

      function divide(n) {
        var i = size, c = 0;
        while (--i >= 0) {
          c += data[i];
          data[i] = Math.floor(c / n);
          c = (c % n) * base;
        }
      }

      function toString() {
        var i = size;
        var s = '';
        while (--i >= 0) {
          if (s !== '' || i === 0 || data[i] !== 0) {
            var t = String(data[i]);
            if (s === '') {
              s = t;
            } else {
              s += '0000000'.slice(0, 7 - t.length) + t;
            }
          }
        }
        return s;
      }

      function pow(x, n, acc) {
        return (n === 0 ? acc : (n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc)));
      }

      function log(x) {
        var n = 0;
        while (x >= 4096) {
          n += 12;
          x /= 4096;
        }
        while (x >= 2) {
          n += 1;
          x /= 2;
        }
        return n;
      }

      Number.prototype.toFixed = function (fractionDigits) {
        var f, x, s, m, e, z, j, k;

        // Test for NaN and round fractionDigits down
        f = Number(fractionDigits);
        f = f !== f ? 0 : Math.floor(f);

        if (f < 0 || f > 20) {
          throw new RangeError("Number.toFixed called with invalid number of decimals");
        }

        x = Number(this);

        // Test for NaN
        if (x !== x) {
          return "NaN";
        }

        // If it is too big or small, return the string value of the number
        if (x <= -1e21 || x >= 1e21) {
          return String(x);
        }

        s = "";

        if (x < 0) {
          s = "-";
          x = -x;
        }

        m = "0";

        if (x > 1e-21) {
          // 1e-21 < x < 1e21
          // -70 < log2(x) < 70
          e = log(x * pow(2, 69, 1)) - 69;
          z = (e < 0 ? x * pow(2, -e, 1) : x / pow(2, e, 1));
          z *= 0x10000000000000; // Math.pow(2, 52);
          e = 52 - e;

          // -18 < e < 122
          // x = z / 2 ^ e
          if (e > 0) {
            multiply(0, z);
            j = f;

            while (j >= 7) {
              multiply(1e7, 0);
              j -= 7;
            }

            multiply(pow(10, j, 1), 0);
            j = e - 1;

            while (j >= 23) {
              divide(1 << 23);
              j -= 23;
            }

            divide(1 << j);
            multiply(1, 1);
            divide(2);
            m = toString();
          } else {
            multiply(0, z);
            multiply(1 << (-e), 0);
            m = toString() + '0.00000000000000000000'.slice(2, 2 + f);
          }
        }

        if (f > 0) {
          k = m.length;

          if (k <= f) {
            m = s + '0.0000000000000000000'.slice(0, f - k + 2) + m;
          } else {
            m = s + m.slice(0, k - f) + '.' + m.slice(k - f);
          }
        } else {
          m = s + m;
        }

        return m;
      }
    }());
  }


//
// String
// ======
//


// ES5 15.5.4.14
// http://es5.github.com/#x15.5.4.14

// [bugfix, IE lt 9, firefox 4, Konqueror, Opera, obscure browsers]
// Many browsers do not split properly with regular expressions or they
// do not perform the split correctly under obscure conditions.
// See http://blog.stevenlevithan.com/archives/cross-browser-split
// I've tested in many browsers and this seems to cover the deviant ones:
//    'ab'.split(/(?:ab)*/) should be ["", ""], not [""]
//    '.'.split(/(.?)(.?)/) should be ["", ".", "", ""], not ["", ""]
//    'tesst'.split(/(s)*/) should be ["t", undefined, "e", "s", "t"], not
//       [undefined, "t", undefined, "e", ...]
//    ''.split(/.?/) should be [], not [""]
//    '.'.split(/()()/) should be ["."], not ["", "", "."]

  var string_split = String.prototype.split;
  if (
    'ab'.split(/(?:ab)*/).length !== 2 ||
    '.'.split(/(.?)(.?)/).length !== 4 ||
    'tesst'.split(/(s)*/)[1] === "t" ||
    ''.split(/.?/).length === 0 ||
    '.'.split(/()()/).length > 1
  ) {
    (function () {
      var compliantExecNpcg = /()??/.exec("")[1] === void 0; // NPCG: nonparticipating capturing group

      String.prototype.split = function (separator, limit) {
        var string = this;
        if (separator === void 0 && limit === 0)
          return [];

        // If `separator` is not a regex, use native split
        if (Object.prototype.toString.call(separator) !== "[object RegExp]") {
          return string_split.apply(this, arguments);
        }

        var output = [],
          flags = (separator.ignoreCase ? "i" : "") +
            (separator.multiline ? "m" : "") +
            (separator.extended ? "x" : "") + // Proposed for ES6
            (separator.sticky ? "y" : ""), // Firefox 3+
          lastLastIndex = 0,
          // Make `global` and avoid `lastIndex` issues by working with a copy
          separator = new RegExp(separator.source, flags + "g"),
          separator2, match, lastIndex, lastLength;
        string += ""; // Type-convert
        if (!compliantExecNpcg) {
          // Doesn't need flags gy, but they don't hurt
          separator2 = new RegExp("^" + separator.source + "$(?!\\s)", flags);
        }
        /* Values for `limit`, per the spec:
         * If undefined: 4294967295 // Math.pow(2, 32) - 1
         * If 0, Infinity, or NaN: 0
         * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296;
         * If negative number: 4294967296 - Math.floor(Math.abs(limit))
         * If other: Type-convert, then use the above rules
         */
        limit = limit === void 0 ?
          -1 >>> 0 : // Math.pow(2, 32) - 1
          limit >>> 0; // ToUint32(limit)
        while (match = separator.exec(string)) {
          // `separator.lastIndex` is not reliable cross-browser
          lastIndex = match.index + match[0].length;
          if (lastIndex > lastLastIndex) {
            output.push(string.slice(lastLastIndex, match.index));
            // Fix browsers whose `exec` methods don't consistently return `undefined` for
            // nonparticipating capturing groups
            if (!compliantExecNpcg && match.length > 1) {
              match[0].replace(separator2, function () {
                for (var i = 1; i < arguments.length - 2; i++) {
                  if (arguments[i] === void 0) {
                    match[i] = void 0;
                  }
                }
              });
            }
            if (match.length > 1 && match.index < string.length) {
              Array.prototype.push.apply(output, match.slice(1));
            }
            lastLength = match[0].length;
            lastLastIndex = lastIndex;
            if (output.length >= limit) {
              break;
            }
          }
          if (separator.lastIndex === match.index) {
            separator.lastIndex++; // Avoid an infinite loop
          }
        }
        if (lastLastIndex === string.length) {
          if (lastLength || !separator.test("")) {
            output.push("");
          }
        } else {
          output.push(string.slice(lastLastIndex));
        }
        return output.length > limit ? output.slice(0, limit) : output;
      };
    }());

// [bugfix, chrome]
// If separator is undefined, then the result array contains just one String,
// which is the this value (converted to a String). If limit is not undefined,
// then the output array is truncated so that it contains no more than limit
// elements.
// "0".split(undefined, 0) -> []
  } else if ("0".split(void 0, 0).length) {
    String.prototype.split = function (separator, limit) {
      if (separator === void 0 && limit === 0) return [];
      return string_split.apply(this, arguments);
    }
  }


// ECMA-262, 3rd B.2.3
// Note an ECMAScript standart, although ECMAScript 3rd Edition has a
// non-normative section suggesting uniform semantics and it should be
// normalized across all browsers
// [bugfix, IE lt 9] IE < 9 substr() with negative value not working in IE
  if ("".substr && "0b".substr(-1) !== "b") {
    var string_substr = String.prototype.substr;
    /**
     *  Get the substring of a string
     *  @param  {integer}  start   where to start the substring
     *  @param  {integer}  length  how many characters to return
     *  @return {string}
     */
    String.prototype.substr = function (start, length) {
      return string_substr.call(
        this,
        start < 0 ? ((start = this.length + start) < 0 ? 0 : start) : start,
        length
      );
    }
  }

// ES5 15.5.4.20
// http://es5.github.com/#x15.5.4.20
  var ws = "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003" +
    "\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028" +
    "\u2029\uFEFF";
  if (!String.prototype.trim || ws.trim()) {
    // http://blog.stevenlevithan.com/archives/faster-trim-javascript
    // http://perfectionkills.com/whitespace-deviations/
    ws = "[" + ws + "]";
    var trimBeginRegexp = new RegExp("^" + ws + ws + "*"),
      trimEndRegexp = new RegExp(ws + ws + "*$");
    String.prototype.trim = function trim() {
      if (this === void 0 || this === null) {
        throw new TypeError("can't convert " + this + " to object");
      }
      return String(this)
        .replace(trimBeginRegexp, "")
        .replace(trimEndRegexp, "");
    };
  }

//
// Util
// ======
//

// ES5 9.4
// http://es5.github.com/#x9.4
// http://jsperf.com/to-integer

  function toInteger(n) {
    n = +n;
    if (n !== n) { // isNaN
      n = 0;
    } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {
      n = (n > 0 || -1) * Math.floor(Math.abs(n));
    }
    return n;
  }

  function isPrimitive(input) {
    var type = typeof input;
    return (
      input === null ||
      type === "undefined" ||
      type === "boolean" ||
      type === "number" ||
      type === "string"
    );
  }

  function toPrimitive(input) {
    var val, valueOf, toString;
    if (isPrimitive(input)) {
      return input;
    }
    valueOf = input.valueOf;
    if (typeof valueOf === "function") {
      val = valueOf.call(input);
      if (isPrimitive(val)) {
        return val;
      }
    }
    toString = input.toString;
    if (typeof toString === "function") {
      val = toString.call(input);
      if (isPrimitive(val)) {
        return val;
      }
    }
    throw new TypeError();
  }

// ES5 9.9
// http://es5.github.com/#x9.9
  var toObject = function (o) {
    if (o == null) { // this matches both null and undefined
      throw new TypeError("can't convert " + o + " to object");
    }
    return Object(o);
  };

});
